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Discontinued Operations (Detail) - Schedule of assets and liabilities of the discontinued operations (USD $)
In Millions, unless otherwise specified
Feb. 28, 2013
May 31, 2012
Feb. 29, 2012
Property and plant $ 7.0 $ 7.0 $ 9.3
Current assets of discontinued operations 7.0 7.0 9.3
Accrued expenses and other current liabilities 1.6 2.1 1.2
Current liabilities of discontinued operations $ 1.6 $ 2.1 $ 1.2